I do think it's realistic achievement particularly as some Gurdwaras are already doing this. Hitchin Singh Sabha are a great example of a progressive thinking committee. See the 'Accounts' section of their Gurdwara's website - www.sgssh.org.
When the new naujwaan committee came in they wanted to be fully transparent and update the Sangat regularly. They created spreadsheets (accessible on their website), based on the previous 3/4 years accounts, which helps forecast their coming expenses and income. It is labour intensive at the outset to upload all previous accounts records and, as an ongoing requirement, they ensure the Gurdwara treasurer is commercial and excel-literate. However, it's a strong control mechanism.
The Sangat get confidence from the transparency Hitchin Singh Sabha committee provide and the sewadars are able to create a realistic budget for what percentage of the Gurdwara's income they put towards Granthi wages, Parchaar, Youth, Maintenance and New capital projects, etc.
This is definitely a great example of good practice all Gurdwaras can follow.